Board drop hammer



Sept 23-, 1930.

MI C. TALCOTT BOARD DROP Hm! Filed May 8, 1926 R O N E V m 1 Patented Sept. 23, 1930 f i i-S TE P TENTQ P JaoRToiv,o. TALoorr, 'oF'HARTroRD. c mmemewjassi n a 'ro THE, BILLINGS. & y srElvonRcoMrA Y, 'ornnarronn, oomvncrrou'r, A, CORPORATION or common BOARD; naor ma ta Application filed tr s, 926. Serial at. 107,6 2.

' I invention relates more Iparticularlyto board drop. hammers having more than one pair of-lifting'rolls and hence'adapted for operating extra heavy hammers. The object of the invention is the simplification of the means for causing the rolls to grip andre- V V lease thehammer board simultaneously and with substantially equalipressure so as to in. various accompanying Ient preferred. I 51 i head.

1 I avoid temporary overload of either pairof rolls which injures the hammer board.

The invention is susceptible of embodiment drawing in the form at pres- Fig. 1 is a front elevation of a board drop hammer having the invention applied.

Fig. 2 is a larger scale elevation of the roll V Fig. 3 a section thereof, on line IIIIII;

and

s 4 is a horizontal section on line I IV..

The drop hammer consists, as usual, of a 7 base 1, two uprights 2, between which the ammer proper 3 is guided and lifted by the hammer board 4, and a superstructure or onroll shafts 6. '30- two lifting rolls 7 roll head frame 5. -The several pairs of lift ing rolls, two in the. present case, are fixed The front rolls ars marked 7"and 8 and the rear rolls 7- and 8" respectively. The ends of the shafts 6, front rolls 7 and 8, are journalled in roll carriages 9 mountedfor rectilinear movement in the roll head frame. These roll carriages may consist of blocks of rectangular [cross section, as indicated, fitted in ap propriate slideways 10 in there being one such block to support each end of each roll shaft.

the head frame,

Whenthe hammer is being lifted, part of its weight, which may be several thousand pounds, is borne by the and 8 and by the latter I transmitted with substantial equality to the bottoms of the upper and lower horizontal slideways of the head structure and as the latter face the roll carriages .9 move v in both'directions and due to have bearing surfreely thereon the flatness of considerable these surfaces, quite as freely in one direction as the other which is an advantagein forms and is illustrated in the m b understood thatthe friction bar for the producing simultaneous and equal move 7 ment in that the effect of the gravity of the rolls on the roll-moving and roll-driving meansis thus largely eliminated;

lever'sj1'2,placed closedto the uprights of the head frame. The levers 12 are fulcrumed on the eccentric ends 1310f a sleeve 14 and the arm 15 of this sleeve is connected, directly orotherwisefto the frictionbar 16 or to such other. hammer-controlled actuating means as maybeemployed in the particular hammer." Tl 1e*eccentric sleeve 14 is jour- 'nalled 011 a cross "shaft l? "fixed in lugs projecting' forwardly from the head frame as indicated'in Fig. 4. Vertical movement of the'friction bar'16 will thus move the roll carriages 9 in their slideways toward and from thehammer fulcrum of the board and inasmuchas the connection';of the links 11 therewith, the pressure exertedby the friction bar will be equally divided between the rolls 7 and 8.

ls/operated or controlled bythe hammer 3 as customary. That is to I say its lower end extends through aknock-oif mechanism indicated generally by the numeral 18 and containing a knock-offbolt adapted to hold the frictionbar in its elevated position until -engaged by the cam face 19 011 the hammer, whereuponthe 'bolt is operated to release the friction bar, allowing it to descend.' This downward movement, by rocking the eccentrics13, advances the front rolls 7 and 8 against the board, causing the hammer to be again lifted. In its upstroke the stud 20 on the hammer engages and lifts a lever 21 connectedto thefriction bar so as to raise the latter. Such upward movement of the 'friction bar simultaneously withdraws both front hammer again falls and so on.

The upper front roll"? is driven by the f? yoke structure represented :2 by the two levers 12, is central between the olls fromtheha'mmer board, so that the roll 8 is similarly driven by gearing 24: and

gearing 22 from the axle of the rear roll and the pulley 23 thereon. The lower front abelt pulley 25 on thecorrespon'ding rear roll shaft. I 1 The rear rolls are journalled, as customary int-his art, in eccentric bushings 26, the rearwardly projecting arms of which are rigidly board, upper joined together by cross pins 27 and the cross pins ,of the upper andlower rolls are both connectedto anadjustment rod 28,.the longitudinal position of which determines the position of the rear rolls with reference to the s'ur'face of the hammer board Below.

'' treadle 30, as usual;

' lower carriages for 1. In a 'multiple roll -set boarddrop ham- 'mer, the combination of upper andlower the rolls the machine is provided withthe usual board clamp 29 controlled by the foot I claim board lifting rolls, independent upper and the rolls of each roll-set therein, upper and lower eccentric roll carriages rotatably mounted in said head structure, lifting rolls journa-lled in all said Carl's:

riages and means for equally pressing-said sliding carriages towardsaid eccentric car riage the machine, a driven lifting roll .journalled in each of saidcarriages, a yoke member connected to said carrlages and hammer=con In aboardadrop hammer, ai'hamme'r and lower roll carri'agesindet pendently mounted in the frame structure of p trolled means for moving said yoke member, 1 V

in a direction toward and from the hammer board.

. In testimony whereof, I have i i 7 specification.

MORTON w om;

each such carriagehaving a slideway and vbeing mounted therein for rectilinear movement toward and from the hammer -board, pressure 1 equalizing means connecting said carriages andhammer-controlled mechanism for moving said'equalizingvmeans and also said roll carriages toward the hammer board.

2. In a multiple roll-setboard drop-hammer, the combination of upper and lower 7 board-lifting rolls, independent; upper and lower roll carriages'therefor, aj'yoke structure pivotally connected to said-carriages, an

eccentric for' actuating said yoke structure and a friction bar connected to operate said eccentric. I

3. In a multiple roll-setiboard.drop hamupper. and lowerpairs of lifting rolls, carriage: means for one roll of the upper pair, independent carriage means for one roll of a lower pair, slideways formed in structure for each of said carriage means,

:and means controlled by the-hammer for moving said carriage means in said slideways, I said means being adaptedto pressthe rolls men-the combination of thehammer'board, 3

the head c with equal pressure against-the hammer I board.

- 4. In a multiple roll-set boardld rop hami i V for one roll of the upper pair, independent sliding carriage means for "mer, thejcombinationofthe hammer board, upper and lower pairs of lifting rolls,sliding carriage means one roll of a lower pair, horizontal slide- Ways for bothvcarrlage means, means enand lower carriage e 

